Manufacturing means from wood-tar for preventing dust on streets, roads, and the like.



" ticularly known to make such means Umrnn STATES PATENT ornron.

STEPHAN MATTAR, OF LEIPZIG, AND ROBERT FUNOKE, OF LORCH,

' GERMANY.

MANUFACTURING MEANS FROM W0 0D-TAR FOR PREVENTlNG DUST 0N STREETS, ROADS, AND THE LIKE.

Specification of Letters Iatent.

Patented June 4, 1907;

Application filed September 1, 1906. Serial N 0. 388,030. I

1'0 all whom it may concern.-

Be it known that We, STEPHAN MATTAR and ROBERT FUNoKn, subjects ofthe Ge man Emperor, resi at Leipzig, Germany, (h/IATTAR,) and Lore Wurtemberg, .Germany, (FUNCKE,) have invented new and useful Improvements in Manufacturing Means from Wood-Tar for Preventin Dust on Streets, Roads, andthe Like, of which the following is a specification.

The present invention has for its object a method of manufacturing meansfrom woodtar for preventingdust on streets, roads and the like.

Means for preventing inconveniences which are caused by dust on streets have already been variously proposed. "t isfparo petroleum residues, mineral oils, or the like, as also to .obtain them by mixing distilled coaltar, namely coal-tar deprived of its more volatile constituents and of water, with various additional materials. Further, it is also known to employ such coal-tar mixtures deprived of their more volatile constituents in such a manner that they are sprinkled on the road concerned from a cart ca a boiler provided with a heating device. lNevertheess the means proposed hitherto are by no means of the kind to meet all the requirements made of them. Especially the means proposal to em 1ts more volat of thefor preventing dust made from the residue of petroleum proved from the first to be much too expenslve, because the coat'or s rinkling required too he uent' renewal, quite apart from itsabsolute y not attaining the desired p 'ose. Goal-tar has a very penetrating sme for the dwellers in and users of the streets concerned. Also the upper surfaces streets treated with it do not attain sufiicient hardness, so that the tar only ex-r' ercises a more or less passing'effect. The loy it after the distillation of e constituentsin its heated state decided] increased the ex ense of the method, and her had the do "eat that accidents could happen in consequence of burning or scalding, and, moreover,-could not in any way remed the disadvantages mentioned. We, on t e contrary, have succeeded in making a means for preventing dust from wood-te.r, which letter 15 a substance differ-- mg radically in its entire properties from coal-v tar; said means satisfies the requirements in- .cause it has a strong smell in dicated, and is of thoroughly enduring effect, as it is also insoluble in Water and thus cannot be washed away by rain. It may also be pointed out that wood-tar, especially beech-wood tar, has hitherto been a material for which 7 a profitable employment was wanting. Wood-tar has hitherto not been employed for the purpose in question, beits raw state, and because it was assumed from the first that this smell could be as little got rid of, by simply driving off the more volatile constituents, asthat of coal-tar. theless found that this is not the case and that a good means for preventing dust in streets maybe made in this manner.

In accordance with the present invention all the more volatile constituents are in the first place for this purpose liberated from the wood-tar by heating it to about 200 C. In the first place the so-called first runnings which cause the usualsmell of wood-tar are driven off, and secondly the water is removed which otherwise forms a preventive for the drying of the tar used for sprinkling the streets. Although the residue thus obtained could be .used forthwith as means for the prevention of dust in streets, it is preferable to mix enhance its action. Accordingly the residual wood-tar is mixed with creosote oil oranthracene oil, or with both oils simultaneously. Preferably a mixture of onepart by weight of wood-tar and two parts by weight'of the oils mentioned (reckoned together) is employed; these proportions, however, may be more or less departed from. Instead of creosote oil and anthracene oil, moreover, other substances, which likewise have a sufficiently liquid consistency and act in a similar manner, may be used, namely petroleum distillates or vegetable oils which become resinous.

The means for preventing dust here described may be applied to the surface of the roads in any desired suitable manner, for exam le by pouring by means of watering cans, y sprinkling by means of suitably constructed watering carts, by spraying by means ofmechanical or compressed-air 'sprayers, or .the' like.

The advanta es of the new method consist in its supp yin means which may be v applied cold and w completely harden We have never-.

it with suitable additions which after a short time, but which remain elastic. Moreover it makes impervious the upper surface of the street and powerfully resists the action of the Weather for a long time.

Therefore the means according to the present invention actually make the roads firmer, contrary to those used hitherto which were made from petroleum and coal-tar. Lastly, the employment of Wood-tar is in itself of great economic advantage, as already indicated.

l/Vhat We claim as our invention and desire to secure by Letters Patent is:

1. A method of manufacturing means for the prevention of dust, consisting in heating wood-tar to about 200 C, and driving off the more volatile constituents, and in adding less volatile products of the drydistillation of natural carbon compounds, substantially. as described.

2. A method of manufacturing means for the prevention of dust, consisting in heating Wood-tar to about4200 C. and driving 01f the morevolatile constituents, and adding creosote oil, substantially as described.

3. A method of manufacturing means for the prevention of dust, consistingin heating wood-tar to about 200 C. and off the more volatile constituents, and adding an-" thracene oil, substantially as described,

4. A method of manufacturing means for the prevention: o'f dust, consisting in heating woodtar to about 200 C. and driving ofi the more volatile constituents, and adding creosote oil and anthracene oil, substantially as described. 1

5. A method of manufacturing means for the prevention of dust, consistingin heating Wood-tar to about 200 C. and driving ofl the more volatile constituents, and adding dis- STEPHAN' MATTAR. ROBERT FUNCKE;

Witnesses as to Stephan Mattar:

. CURT VIEHRIG,

RUDOLPH FRrcKE. Witnesses as to R. Funcke:

-WM. HAHN, ERNST ENTENM'ANN. 

